/*
Copyright 2016 OpenMarket Ltd
Copyright 2019, 2020 The Matrix.org Foundation C.I.C.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

import React from "react";
import { AuthType, IAuthData } from "matrix-js-sdk/src/interactive-auth";
import { logger } from "matrix-js-sdk/src/logger";
import { MatrixClient } from "matrix-js-sdk/src/matrix";

import { MatrixClientPeg } from "../../../MatrixClientPeg";
import { _t } from "../../../languageHandler";
import InteractiveAuth, { ERROR_USER_CANCELLED, InteractiveAuthCallback } from "../../structures/InteractiveAuth";
import { ContinueKind, SSOAuthEntry } from "../auth/InteractiveAuthEntryComponents";
import StyledCheckbox from "../elements/StyledCheckbox";
import BaseDialog from "./BaseDialog";
import defaultDispatcher from "../../../dispatcher/dispatcher";
import { Action } from "../../../dispatcher/actions";

type DialogAesthetics = Partial<{
    [x in AuthType]: {
        [x: number]: {
            body: string;
            continueText?: string;
            continueKind?: ContinueKind;
        };
    };
}>;

interface IProps {
    onFinished: (success?: boolean) => void;
}

interface IState {
    shouldErase: boolean;
    errStr: string | null;
    authData: any; // for UIA
    authEnabled: boolean; // see usages for information

    // A few strings that are passed to InteractiveAuth for design or are displayed
    // next to the InteractiveAuth component.
    bodyText?: string;
    continueText?: string;
    continueKind?: ContinueKind;
}

export default class DeactivateAccountDialog extends React.Component<IProps, IState> {
    public constructor(props: IProps) {
        super(props);

        this.state = {
            shouldErase: false,
            errStr: null,
            authData: null, // for UIA
            authEnabled: true, // see usages for information
        };

        this.initAuth(/* shouldErase= */ false);
    }

    private onStagePhaseChange = (stage: AuthType, phase: number): void => {
        const dialogAesthetics = {
            [SSOAuthEntry.PHASE_PREAUTH]: {
                body: _t("settings|general|deactivate_confirm_body_sso"),
                continueText: _t("auth|sso"),
                continueKind: "danger",
            },
            [SSOAuthEntry.PHASE_POSTAUTH]: {
                body: _t("settings|general|deactivate_confirm_body"),
                continueText: _t("settings|general|deactivate_confirm_continue"),
                continueKind: "danger",
            },
        };

        // This is the same as aestheticsForStagePhases in InteractiveAuthDialog minus the `title`
        const DEACTIVATE_AESTHETICS: DialogAesthetics = {
            [SSOAuthEntry.LOGIN_TYPE]: dialogAesthetics,
            [SSOAuthEntry.UNSTABLE_LOGIN_TYPE]: dialogAesthetics,
        };

        const aesthetics = DEACTIVATE_AESTHETICS[stage];
        let bodyText: string | undefined;
        let continueText: string | undefined;
        let continueKind: ContinueKind | undefined;
        if (aesthetics) {
            const phaseAesthetics = aesthetics[phase];
            if (phaseAesthetics) {
                if (phaseAesthetics.body) bodyText = phaseAesthetics.body;
                if (phaseAesthetics.continueText) continueText = phaseAesthetics.continueText;
                if (phaseAesthetics.continueKind) continueKind = phaseAesthetics.continueKind;
            }
        }
        this.setState({ bodyText, continueText, continueKind });
    };

    private onUIAuthFinished: InteractiveAuthCallback<Awaited<ReturnType<MatrixClient["deactivateAccount"]>>> = async (
        success,
        result,
    ) => {
        if (success) return; // great! makeRequest() will be called too.

        if (result === ERROR_USER_CANCELLED) {
            this.onCancel();
            return;
        }

        logger.error("Error during UI Auth:", { result });
        this.setState({ errStr: _t("settings|general|error_deactivate_communication") });
    };

    private onUIAuthComplete = (auth: IAuthData | null): void => {
        // XXX: this should be returning a promise to maintain the state inside the state machine correct
        // but given that a deactivation is followed by a local logout and all object instances being thrown away
        // this isn't done.
        MatrixClientPeg.safeGet()
            .deactivateAccount(auth ?? undefined, this.state.shouldErase)
            .then((r) => {
                // Deactivation worked - logout & close this dialog
                defaultDispatcher.fire(Action.TriggerLogout);
                this.props.onFinished(true);
            })
            .catch((e) => {
                logger.error(e);
                this.setState({ errStr: _t("settings|general|error_deactivate_communication") });
            });
    };

    private onEraseFieldChange = (ev: React.FormEvent<HTMLInputElement>): void => {
        this.setState({
            shouldErase: ev.currentTarget.checked,

            // Disable the auth form because we're going to have to reinitialize the auth
            // information. We do this because we can't modify the parameters in the UIA
            // session, and the user will have selected something which changes the request.
            // Therefore, we throw away the last auth session and try a new one.
            authEnabled: false,
        });

        // As mentioned above, set up for auth again to get updated UIA session info
        this.initAuth(/* shouldErase= */ ev.currentTarget.checked);
    };

    private onCancel(): void {
        this.props.onFinished(false);
    }

    private initAuth(shouldErase: boolean): void {
        MatrixClientPeg.safeGet()
            .deactivateAccount(undefined, shouldErase)
            .then((r) => {
                // If we got here, oops. The server didn't require any auth.
                // Our application lifecycle will catch the error and do the logout bits.
                // We'll try to log something in an vain attempt to record what happened (storage
                // is also obliterated on logout).
                logger.warn("User's account got deactivated without confirmation: Server had no auth");
                this.setState({ errStr: _t("settings|general|error_deactivate_no_auth") });
            })
            .catch((e) => {
                if (e && e.httpStatus === 401 && e.data) {
                    // Valid UIA response
                    this.setState({ authData: e.data, authEnabled: true });
                } else {
                    this.setState({ errStr: _t("settings|general|error_deactivate_invalid_auth") });
                }
            });
    }

    public render(): React.ReactNode {
        let error: JSX.Element | undefined;
        if (this.state.errStr) {
            error = <div className="error">{this.state.errStr}</div>;
        }

        let auth = <div>{_t("common|loading")}</div>;
        if (this.state.authData && this.state.authEnabled) {
            auth = (
                <div>
                    {this.state.bodyText}
                    <InteractiveAuth
                        matrixClient={MatrixClientPeg.safeGet()}
                        authData={this.state.authData}
                        // XXX: onUIAuthComplete breaches the expected method contract, it gets away with it because it
                        // knows the entire app is about to die as a result of the account deactivation.
                        makeRequest={this.onUIAuthComplete as any}
                        onAuthFinished={this.onUIAuthFinished}
                        onStagePhaseChange={this.onStagePhaseChange}
                        continueText={this.state.continueText}
                        continueKind={this.state.continueKind}
                    />
                </div>
            );
        }

        // this is on purpose not a <form /> to prevent Enter triggering submission, to further prevent accidents
        return (
            <BaseDialog
                className="mx_DeactivateAccountDialog"
                onFinished={this.props.onFinished}
                titleClass="danger"
                title={_t("settings|general|deactivate_section")}
                screenName="DeactivateAccount"
            >
                <div className="mx_Dialog_content">
                    <p>{_t("settings|general|deactivate_confirm_content")}</p>
                    <ul>
                        <li>{_t("settings|general|deactivate_confirm_content_1")}</li>
                        <li>{_t("settings|general|deactivate_confirm_content_2")}</li>
                        <li>{_t("settings|general|deactivate_confirm_content_3")}</li>
                        <li>{_t("settings|general|deactivate_confirm_content_4")}</li>
                        <li>{_t("settings|general|deactivate_confirm_content_5")}</li>
                    </ul>
                    <p>{_t("settings|general|deactivate_confirm_content_6")}</p>

                    <div className="mx_DeactivateAccountDialog_input_section">
                        <p>
                            <StyledCheckbox checked={this.state.shouldErase} onChange={this.onEraseFieldChange}>
                                {_t("settings|general|deactivate_confirm_erase_label")}
                            </StyledCheckbox>
                        </p>
                        {error}
                        {auth}
                    </div>
                </div>
            </BaseDialog>
        );
    }
}
